I don't recommend A-1, go with the big company instead and here's why:
I called them to schedule diagnosis & repair of my GE GFW850SPN1R washer (purchased 2021) and the women who answered was nice, she took my name, phone and address, and said Tyler would be able to come the next day.
The next day Tyler called and shared he was on his way, and reminded me of the cost. He arrived and I shared what happened with the washer, and what I'd tried to do to fix it (youtube videos). He opened/closed the door a couple of times, did zero diagnostics and said his guess would be the main control and inverter boards, and quoted me $650. I'd expected him to at least go into the washer's service mode, read the codes and try to eliminate other issues but he didn't, and he seemed bothered when I asked if he wasn't going to do that. I asked because he didn't do anything but try to open/close the door a few times, and start a cycle. He kept saying the washer was acting stupid and that his best guess were those two boards. I asked if I'd get some type of credit for misdiagnosing (guessing) if the repairs didn't fix the issue and he said no, that I'd still be responsible for the additional repairs. He joked about not being able to plug into it with a computer and find out the issue.
I then did what I should have done from the beginning, I called GE Appliance repair and they came out, plugged into the washer's ethernet port with their laptop, ran each function to eliminate other issues and pinpointed the exact issue. He spent a good while diagnosing and eliminating other issues, including plugging in a brand new door lock to eliminate that being the issue.
My recommendation, go with the manufacturer's certified/in-house repair option and save time & money. They could have asked what type of washer I had when I called to setup an appointment and they could have said they support that model because they don't have the knowledge or equipment to diagnose appropriately and I would have thanked them for being transparent, and moved on. I encourage you to not make the mistake I made.
Updated (1-31-25 5:34pm): The owner is negating this review stating it's not his company that I worked with and called, so I've uploaded the receipt they provided and the call I made matching their phone number. I was hoping for a different response from the owner but I guess this is the standard for his business.